How about those front tub numbers? It looks to me a front clip from another car was used as the old serial number is Xed out and the RS number crudely stamped in. The seller says repaired from new parts but a number would not be stamped in, at least how it is shown. I suppose the other number could be an exchange chassis number. I bet she was cut from the dash/cowl foward. Pictures of the bottom would be good to see where the splice was made.

Best,

Don